Lady Fiona Carnarvon became the chatelaine of Highclere Castle - the setting of the hit series Downton Abbey - eight years ago. In that time she's become fascinated by the history of Highclere, particularly Lady Almina, the 5th Countess of Carnarvon, the illegitimate daughter of banking tycoon Alfred de Rothschild. At first, life at Highclere was a dizzying mix of sumptuous banquets for 500 and even the occasional royal visitor. But when the First World War broke out, life at Highclere changed forever.